Signal Spotlights: Greenwich Adaptive Control Signal Technology Project

traffic_signal_spotlights_logo The Arch Street corridor in Greenwich experiences heavy congestion due to commuter traffic associated with I-95 as well as the train station and downtown central business district. This congestion results in excess delay and queues that extend onto the I-95 Exit 3 ramp.


The town plans to alleviate some of this congestion by using an adaptive control system to allocate appropriate green time to the highest volume approach based on existing conditions on the road at that time.

The following intersections will be placed under adaptive control:

  • Greenwich Avenue/Railroad Avenue/Steamboat Road/Bruce Park Drive
  • Steamboat Road/Arch Street/Museum Drive
  • Arch Street at Island Beach crossing
  • Arch Street at I-95 North Exit 3
  • Arch Street at I-95 South Exit 3
  • Arch Street at Horseneck Lane
  • Arch Street at Railroad Avenue

By adapting to the traffic conditions in real time, it is anticipated that the signal system could create better traffic flow, decreasing queuing that occurs on the I-95 Exit 3 ramp, decreasing idling times at red lights and minimizing congestion along the corridor.

This corridor will be a test area and if successful, future long-term signal planning would include ASCT at other locations in town. Traffic data obtained on the effectiveness of the ASCT would be shared with FHWA to aid in making ASCT a mainstream tool through the Every Day Counts ASCT initiative.


For more information on adaptive signal control technologies, visit the Every Day Counts page:


About Connecticut T2 Center

The Training & Technical Assistance Center at UCONN provides education and technical assistance to members of Connecticut's Transportation and Public Safety Community, including municipal public works directors, street and road maintenance superintendents and staff, city and town engineers, Connecticut Department of Transportation employees, transportation planners and law enforcement professionals serving as legal traffic authorities. We are Connecticut's LTAP Center
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